Pub Date : 2019-06-01DOI: 10.1109/BlackSeaCom.2019.8812774
E. Avdotin, D. Bankov, E. Khorov, A. Lyakhov
Support of real-time applications that impose strict requirements on packet loss ratio and latency is an essential feature of the next generation Wi-Fi networks. Initially introduced in the 802.11ax amendment to the Wi-Fi standard, uplink OFDMA seems to be a promising solution for supported lowlatency data transmission from the numerous stations to an access point. In this paper, we study how to allocate OFDMA resources in an 802.11ax network and propose an algorithm aimed at providing the delay less than one millisecond and reliability up to 99.999% as required by numerous real-time applications. We design a resource allocation algorithm and with extensive simulation, show that it decreases delays for real-time traffic by orders of magnitude, while the throughput for non-real-time traffic is reduced insignificantly.
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Pub Date : 2019-06-01DOI: 10.1109/BlackSeaCom.2019.8812810
Vyacheslav Loginov, A. Lyakhov, V. Zhdanovskiy
Due to increasing demand for throughput of cellular networks, the 3GPP consortium has developed LTE-LAA technology which allows LTE networks to use unlicensed frequency bands in 5 GHz spectrum for data transmission. Since this part of spectrum is already used by Wi-Fi networks, LTE-LAA introduces listen-before-talk (LBT) channel access mechanism for fair channel sharing. LBT is based on CSMA/CA and uses binary exponential backoff similar to Wi-Fi. However, there are some important differences. First, by default, LTE-LAA transmission is longer than Wi-Fi one. Second, due to technology constraints, LTE-LAA data transmission in unlicensed spectrum can only be started at the licensed spectrum slot boundaries (LSSBs). If the LTE-LAA BS remains silent between the end of backoff procedure and LSSB, some Wi-Fi stations may occupy the channel. In many papers, to save the channel for the LTE-LAA transmission, it is proposed to send reservation signal until the closest LSSB after the backoff procedure finish. Because of aforementioned differences, channel resource sharing between LTE-LAA and Wi-Fi devices appears to be unfair. In this paper, we propose to limit the reservation signal duration in order to achieve fair LTE-LAA/Wi-Fi coexistence. We implement the proposed solution in the ns-3 simulator and prove its efficiency in different scenarios.
{"title":"Performance Analysis of LBT with Limited Reservation Signal Duration for Fair LTE-LAA/Wi-Fi Coexistence","authors":"Vyacheslav Loginov, A. Lyakhov, V. Zhdanovskiy","doi":"10.1109/BlackSeaCom.2019.8812810","DOIUrl":"https://doi.org/10.1109/BlackSeaCom.2019.8812810","url":null,"abstract":"Due to increasing demand for throughput of cellular networks, the 3GPP consortium has developed LTE-LAA technology which allows LTE networks to use unlicensed frequency bands in 5 GHz spectrum for data transmission. Since this part of spectrum is already used by Wi-Fi networks, LTE-LAA introduces listen-before-talk (LBT) channel access mechanism for fair channel sharing. LBT is based on CSMA/CA and uses binary exponential backoff similar to Wi-Fi. However, there are some important differences. First, by default, LTE-LAA transmission is longer than Wi-Fi one. Second, due to technology constraints, LTE-LAA data transmission in unlicensed spectrum can only be started at the licensed spectrum slot boundaries (LSSBs). If the LTE-LAA BS remains silent between the end of backoff procedure and LSSB, some Wi-Fi stations may occupy the channel. In many papers, to save the channel for the LTE-LAA transmission, it is proposed to send reservation signal until the closest LSSB after the backoff procedure finish. Because of aforementioned differences, channel resource sharing between LTE-LAA and Wi-Fi devices appears to be unfair. In this paper, we propose to limit the reservation signal duration in order to achieve fair LTE-LAA/Wi-Fi coexistence. We implement the proposed solution in the ns-3 simulator and prove its efficiency in different scenarios.","PeriodicalId":359145,"journal":{"name":"2019 IEEE International Black Sea Conference on Communications and Networking (BlackSeaCom)","volume":"32 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124209821","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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